But for his kind help,I ______ this experiment so quickly.

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But for his kind help,I ______ this experiment so quickly.
A.shouldn’t be finishing
B.couldn’t finish
C.hadn’t finished
D.wouldn’t have finished
我觉得是考虚拟语气吧,但是我不懂得是,我完成实验这么快,是跟现在事实相反,应该用过去式吧?为什么用现在完成时?
老师教与现在事实相反用过去与过去事实相反用过去完成
would have是哪一种呢？

这不是现在完成时的问题,I wouldn't have finished：我过去不可能完成,是主句里用来表虚拟的.
买本语法书吧上面都有

She had been kind to me, so I felt ______ to help her when s 非谓语动词345.Tim cannot but ______ his supervisor to help him so I did not ask for his help this morning.He__his help to me. 1.______ help Jerry,but he destroyed his plan. This experiment is so dangerous .I must have Jack ——— it A.m 14.______,I must do another experiment.a.Be it ever so late I () able to help you,but I was so busy. There was nothing to do but wait for his help. This kind of bike is cheap but that kind of bike is ______ 英语翻译Time passes by so quickly but I guess I thought you'd be 英语翻译but i so like this name .but i like this name so much. This is 什么 want for the experiment